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JEE Main & Advanced Chemistry Redox Reactions / रेडॉक्स अभिक्रियाएँ Question Bank Mock Test - Redox Reactions

  • question_answer
    An element A in a compound ABD has oxidation number \[{{A}^{{{n}^{-}}}}\]. It is oxidised by \[C{{r}_{2}}O_{7}^{2-}\] in acid medium. In the experiment \[1.68\times {{10}^{-3}}\]moles of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]was used for \[3.26\times {{10}^{-3}}\]moles of ABD. The new oxidation number of A after oxidation is:

    A) 3

    B) 3-n

    C) n-3      

    D) +n

    Correct Answer: B

    Solution :

    [b] Meq. of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}=Meq.\]of ABD n-factor of \[{{K}_{2}}C{{r}_{2}}{{O}_{7}}\]in acidic medium =6 \[6\times 1.68\times {{10}^{-3}}=x\times 3.26\times {{10}^{-3}}\] \[x=3\] \[\Rightarrow \]New oxidation state of \[{{A}^{-n}}\]will be =-n+3


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